NASA's Solar Terrestrial Relations Observatory (STEREO) captured this image of a coronal mass ejection on Nov. 20, 2012 at 8:54 a.m. EST, about two hours after it left the sun. Credit: NASA/STEREO
Experimental NASA research models, based on observations from the Solar Terrestrial Relations Observatory (STEREO), show that the Nov. 20 CME left the sun at speeds of 450 miles per second, which is a slow to average speed for CMEs.
CMEs can cause a space weather phenomenon called a geomagnetic storm, which occurs when CMEs successfully connect up with the outside of the Earth's magnetic envelope, the magnetosphere, for an extended period of time.
In the past, CMEs of this speed have not usually caused substantial geomagnetic storms. They have caused auroras near the poles but are unlikely to cause disruptions to electrical systems on Earth or interfere with GPS or satellite-based communications systems.
NOAA's Space Weather Prediction Center (http://swpc.noaa.gov) is the United States government's official source for space weather forecasts.
What is a CME?
http://www.nasa.gov/mission_pages/sunearth/spaceweather/index.htmlKaren C. Fox
Karen C. Fox | EurekAlert!
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